Preparation, First Structure Analysis, and Magnetism of the Long‐Known Nickel Benzoate Trihydrate – A Linear Ni···Ni···Ni Polymer and Its Parallels with the Active Site of Urease

Anna Vráblová; Larry R. Falvello; Javier Campo; Jozef Miklovič; Roman Boča; Juraj Černák; Milagros Tomás

doi:10.1002/ejic.201501255

journal article Jan 15, 2016

Preparation, First Structure Analysis, and Magnetism of the Long‐Known Nickel Benzoate Trihydrate – A Linear Ni···Ni···Ni Polymer and Its Parallels with the Active Site of Urease

Anna Vráblová Larry R. Falvello Javier Campo Jozef Miklovič Roman Boča Juraj Černák Milagros Tomás

European Journal of Inorganic Chemistry Vol. 2016 No. 6 pp. 928-934 · Wiley

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Abstract

AbstractNickel benzoate trihydrate (1) has been prepared in single‐crystalline form by the reaction of nickel carbonate with benzoic acid in boiling aqueous solution. Its crystal structure comprises positively charged [Ni(Bz)(H2O)2]nn+ chains, benzoate anions, and one independent water molecule of solvation. The hexacoordinate NiII centers in the chains are triply bridged by one syn‐syn carboxylato and two aqua bridges, and adjacent chains are linked by O–H···O hydrogen bonds [O···O distances are in the range 2.647(3)–2.684(3) Å] through solvate water molecules and benzoate anions. Thermal analysis revealed that 1 is stable up to 100 °C; further heating led to full dehydration accompanied by an additional decomposition reaction, as characterized by IR analysis of the intermediates. The geometrical features of the Ni centers have been compared with similar features at the active sites of urease. The effective magnetic moment per formula unit µeff has a value of 3.17µB at room temperature and upon cooling reaches a maximum value of 12.39µB at T = 4.6 K, which indicates ferromagnetic coupling between the nearest NiII atoms [3.0671(1) Å] within the chains; at lower temperatures this is counteracted by zero‐field splitting.

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Published: Jan 15, 2016
Vol/Issue: 2016(6)
Pages: 928-934
License: View

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Cite This Article

Anna Vráblová, Larry R. Falvello, Javier Campo, et al. (2016). Preparation, First Structure Analysis, and Magnetism of the Long‐Known Nickel Benzoate Trihydrate – A Linear Ni···Ni···Ni Polymer and Its Parallels with the Active Site of Urease. European Journal of Inorganic Chemistry, 2016(6), 928-934. https://doi.org/10.1002/ejic.201501255

Preparation, First Structure Analysis, and Magnetism of the Long‐Known Nickel Benzoate Trihydrate – A Linear Ni···Ni···Ni Polymer and Its Parallels with the Active Site of Urease

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